Speaking at a business forum in Manila in December 2016, Duterte admitted killing suspected criminals during his time as mayor of Davao City.

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Photos:Rodrigo Duterte has said some outrageous things.

The day after Trump won the US presidential election in November 2016, Duterte said he and Trump share some traits.

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Photos:Rodrigo Duterte has said some outrageous things.

After reports emerged of a potentially blocked arms sale, Duterte told CNN Philippines in November 2016 that he would turn to Russia for weapons.

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Photos:Rodrigo Duterte has said some outrageous things.

During a state visit to China in October 2016, Duterte announced his economic and military 'separation' from the US.

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Photos:Rodrigo Duterte has said some outrageous things.

In October 2016 Duterte expressed growing hostility with the US president.

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Photos:Rodrigo Duterte has said some outrageous things.

After US president Barack Obama said he would raise extrajudicial killings in a meeting with Duterte, the Philippines President responded angrily on September 5, first in English then in Tagalog. As a result, Obama canceled the meeting.

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Photos:Rodrigo Duterte has said some outrageous things.

As he addressed troops at the country's Armed Forces Central Command Headquarters on August 5, Duterte recounted U.S. Secretary of State John Kerry's visit to the country, saying in Tagalog that he was feuding with U.S. Ambassador to the Philippines Philip Goldberg.

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Photos:Rodrigo Duterte has said some outrageous things.

The Philippines president-elect effectively said he supported vigilantism against drug dealers and criminals in a nationally televised speech in June 2016.

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Photos:Rodrigo Duterte has said some outrageous things.

Foreign diplomats weighing in on Rodrigo Duterte's controversial remarks did not sit well with the then-mayor.

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Photos:Rodrigo Duterte has said some outrageous things.

Duterte apologized to the Pope after cursing him for the traffic he caused during a 2015 Papal visit to the Philippines.

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Photos:Rodrigo Duterte has said some outrageous things.

In September 2016, Duterte likened himself to the Nazi leader and announced that he wants to kill millions of drug addicts.

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Photos:Rodrigo Duterte has said some outrageous things.

Speaking at a press conference to unveil his new cabinet on May 31 2016, Rodrigo Duterte said journalists killed on the job in the Philippines were often corrupt.

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Photos:Rodrigo Duterte has said some outrageous things.

During the third and last presidential debate, Duterte had said that he would plant a Philippine flag in disputed territories should China refuse to recognize a favorable ruling for the Philippines.

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Photos:Rodrigo Duterte has said some outrageous things.

Duterte made international headlines in April 2016 with his inflammatory comments on the 1989 rape and murder of an Australian missionary that took place in Davao City.

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Photos:Rodrigo Duterte has said some outrageous things.

He also lashed out at the womens' group that filed a complaint against him before the Commission on Human Rights (CHR).

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Photos:Rodrigo Duterte has said some outrageous things.

At a CNN Philippines Townhall event in February 2016, Duterte, admitted that he had three girlfriends and a common-law wife. His marriage to Elizabeth Zimmerman was annulled due to his womanizing, but he denied this meant he objectified women.

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Photos:Rodrigo Duterte has said some outrageous things.

Although he later denied the accusations, the former Davao City mayor admitted his links to the alleged Davao death squad in a May 2015 broadcast of his local television talk show.

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At the time, Palace peace process adviser, Jesus Dureza, said the President "was not feeling well" which is why he skipped the meetings at the summit between the US and Association of Southeast Asian Nations (ASEAN) in September.

"We absolutely expect (President Obama) will raise concerns about some of the recent statements from the president of the Philippines," White House Deputy National Security Adviser Ben Rhodes told media ahead of the Laos summit.